Thanks that fixed the lag.

It fixed the lighting issue. however now things appear to be a little jumpy even though my fps is steady at 290.

I have found another instance where a similar issue occurs.

I have a iMac (Retina 5K, 27-inch, Mid 2015)

Running on thread: ClientThread
Adapter: null
Driver Version: null
Vendor: ATI Technologies Inc.
OpenGL Version: 2.1 ATI-1.32.24
Renderer: AMD Radeon R9 M290 OpenGL Engine
GLSL Ver: 1.20

I should also mention that I am using an iMac 27in retina display

Here is a close up view

Here is a view from farther away

On a Mac some parts of blocks become invisible when viewed from certain angles. this leads to a very chopped up view of the ship that makes it hard to get an idea of what the ship looks like from that angle.
when I get closer to the ship however the glitch becomes less prominent.